package 集合.day2.demo6;

import java.util.Vector;
import java.util.concurrent.CopyOnWriteArrayList;

public class Test1 {
    public static void main(String[] args) {
        CopyOnWriteArrayList ca=new CopyOnWriteArrayList();
        ca.add("one");
        ca.get(0);
        Vector v=new Vector();
        v.get(0);
    }
}
